Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec145878ed85392…

MALICIOUS

PDF

70.0 KB Created: 2021-09-22 12:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e3200c1b3d56df2913ac7be765e77cbf SHA-1: 612dde0f062b7d8fdf46aaf2169373c590da5fbf SHA-256: 8ec145878ed853923c874064d442b02aaf2b7d1c517f4dc5a511652b1cae51ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious content. The presence of these links and the heuristic firings strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=the+seven+deadly+sins+grand+cross+apk PDF link annotation
    • http://sun-green.de/ckfinder/userfiles/files/xatanefebimunomiz.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/faxapeterixadimepaw.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2uop5pit4uhlmb0cvbhhlsp9q5/79102805490.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/wajisokunitanadikatexekum.pdfIn PDF document text
    • https://rintrans.com/files/kisilonabemoj.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/dobezimuvosituxawol.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/87577882048.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/36931450893.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/85384879881.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/ginivif.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/revimiwuxemopiza.pdfIn PDF document text
    • https://norservis.cz/files/files/21410793036.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/bavomupidevufow.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/11748876854.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/22450206025.pdfIn PDF document text
    • https://suruburi.net/mm/file/vibitin.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/83304009568.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nokovebi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11630234526.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/lisoxe.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/98883243664.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bda2305c6f4b69f40a3d9851fb5297eb/pukipubesutekokibi.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/werosoxutobuma.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 15232 bytes
SHA-256: d5bab3e4709f1dec007e28bf85eb52567e121746e09380da11855184e5109e93
font_01_sfnt_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 10928 bytes
SHA-256: 7e402f50c4f26b8e9a136b8f62785d83acdaf1a2ce89f920ac58c370edd9bb74
font_02_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1